// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_WM_CORE_SHADOW_CONTROLLER_H_
#define UI_WM_CORE_SHADOW_CONTROLLER_H_

#include <map>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "ui/wm/public/activation_change_observer.h"
#include "ui/wm/wm_export.h"

namespace aura {
class Window;
namespace client {
    class ActivationClient;
}
}
namespace gfx {
class Rect;
}

namespace wm {

class Shadow;

// ShadowController observes changes to windows and creates and updates drop
// shadows as needed. ShadowController itself is light weight and per
// ActivationClient. ShadowController delegates to its implementation class,
// which observes all window creation.
class WM_EXPORT ShadowController : public aura::client::ActivationChangeObserver {
public:
    class WM_EXPORT TestApi {
    public:
        explicit TestApi(ShadowController* controller)
            : controller_(controller)
        {
        }
        ~TestApi() { }

        Shadow* GetShadowForWindow(aura::Window* window);

    private:
        ShadowController* controller_; // not owned

        DISALLOW_COPY_AND_ASSIGN(TestApi);
    };

    explicit ShadowController(aura::client::ActivationClient* activation_client);
    ~ShadowController() override;

    // aura::client::ActivationChangeObserver overrides:
    void OnWindowActivated(
        aura::client::ActivationChangeObserver::ActivationReason reason,
        aura::Window* gained_active,
        aura::Window* lost_active) override;

private:
    class Impl;

    aura::client::ActivationClient* activation_client_;

    scoped_refptr<Impl> impl_;

    DISALLOW_COPY_AND_ASSIGN(ShadowController);
};

} // namespace wm

#endif // UI_WM_CORE_SHADOW_CONTROLLER_H_
